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Title: Portable apparatus for the measurement of environmental radon and thoron

Abstract

The radometer is a portable instrument for the measurement of the concentration of atmospheric radon/thoron in a test area. A constant velocity pump pulls the air from the outside at a constant flow rate. If the air is too moist, some or all of the sample is passed through a desiccant filter prior to encountering an electrostatic filter. The electrostatic filter prevents any charged particles from entering the sampling chamber. Once the sample has entered the chamber, the progeny of the decay of radon/thoron are collected on a detector and measured. The measured data is compiled by a computer and displayed.

Inventors:
 [1]
  1. (New Hyde Park, NY)
Publication Date:
Research Org.:
National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV
OSTI Identifier:
873989
Patent Number(s):
US 6288400
Assignee:
United States of America as represented by United States Department (Washington, DC) NETL
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
portable; apparatus; measurement; environmental; radon; thoron; radometer; instrument; concentration; atmospheric; constant; velocity; pump; pulls; air; outside; flow; rate; moist; sample; passed; desiccant; filter; prior; encountering; electrostatic; prevents; charged; particles; entering; sampling; chamber; entered; progeny; decay; collected; detector; measured; data; compiled; computer; displayed; portable instrument; velocity pump; electrostatic filter; charged particles; flow rate; charged particle; atmospheric radon; sampling chamber; filter prevents; constant velocity; constant flow; measured data; table apparatus; /250/

Citation Formats

Negro, Vincent C. Portable apparatus for the measurement of environmental radon and thoron. United States: N. p., 2001. Web.
Negro, Vincent C. Portable apparatus for the measurement of environmental radon and thoron. United States.
Negro, Vincent C. 2001. "Portable apparatus for the measurement of environmental radon and thoron". United States. doi:. https://www.osti.gov/servlets/purl/873989.
@article{osti_873989,
title = {Portable apparatus for the measurement of environmental radon and thoron},
author = {Negro, Vincent C.},
abstractNote = {The radometer is a portable instrument for the measurement of the concentration of atmospheric radon/thoron in a test area. A constant velocity pump pulls the air from the outside at a constant flow rate. If the air is too moist, some or all of the sample is passed through a desiccant filter prior to encountering an electrostatic filter. The electrostatic filter prevents any charged particles from entering the sampling chamber. Once the sample has entered the chamber, the progeny of the decay of radon/thoron are collected on a detector and measured. The measured data is compiled by a computer and displayed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2001,
month = 1
}

Patent:

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  • The radometer is a portable instrument for the measurement of the concentration of atmospheric radon/thoron in a test area. A constant velocity pump pulls the air from the outside at a constant flow rate. If the air is too moist, some or all of the sample is passed through a desiccant filter prior to encountering an electrostatic filter. The electrostatic filter prevents any charged particles from entering the sampling chamber. Once the sample has entered the chamber, the progeny of the decay of radon/thoron are collected on a detector and measured. The measured data is compiled by a computer andmore » displayed.« less
  • This paper reports on the Radometer, which measures radon and thoron by electrostatic collection of charged progeny on a surface barrier detector. Accurate measurements are made in only a few minutes because this instrument uses a dual electric field configuration, thus eliminating filters which slow the response time. An on board computer corrects for the effect of moisture and previous deposition to maintain accuracy and fast response when the instrument encounters high humidity and/or rapid changes in concentration. The instrument's detection volume is 6 L and its efficiency is 25% or .041 cpm per Bq m{sup {minus}3} (1.5 cpm permore » pCi L{sup {minus}1}).« less
  • A method of and an apparatus for detecting and accurately measuring the mean concentrations of .sup.222 Rn and .sup.220 Tn in a gas mixture, such as the ambient atmosphere in a mine, is provided. The apparatus includes an alpha target member which defines at least one operative target surface and which is preferably fabricated from a single piece of an alpha particle sensitive material. At least one portion of the operative target surface is covered with an alpha particle filter. The uncovered and filter covered operative surface is exposed to the gas mixture containing the .sup.222 Rn and .sup.220 Tn.more » In the radioactive decay series of these isotopes the maximum kinetic energy emitted by the alpha decay of .sup.222 Rn is about 1.1 MeV less than the maximum kinetic energy emitted by the alpha decay of a .sup.220 Tn. The alpha particle filter has a predetermined mass per unit area of the covered portion of the operative target surface that prevents penetration of alpha particles which originate from .sup.222 Rn decay, but which allows passage therethrough of the maximum kinetic energy alpha particles from .sup.220 Tn decay. Thus, a count of the alpha particle tracks in the uncovered portion of the target member is proportional to the mean concentration of sum of .sup.222 Rn and .sup.220 Tn in the gas mixture, while the count of alpha tracks in the target member under the filter is proportional to the concentration of only the .sup.220 Tn in the gas mixture.« less
  • To develop a new and novel area and personal radon/thoron detector for both radon isotopes to better measure the exposure to low airborne concentrations of these gases at Fernald. These measurements are to be used to determine atmospheric dispersion and exposure to radon and thoron prior to and during retrieval and removal of the 4000 Ci of radium in the two silos at Fernald.
  • Research Objectives: (1) To develop an accurate personal radon/thoron monitor to quantitate exposure to low airborne concentrations before and during removal and relocation of radium from the silos. (2) To develop a personal aerosol particle size sampler, based on the principles of the novel sampler we have developed. The sampler measures not only 222Rn decay product aerosol size but long lived nuclides. There are, as yet, no particle size distribution data on the aerosol particle size distribution of these nuclides during remediation at any DOE site, although the aerosol particle size is the major determinant of lung dose. (3) Tomore » develop the sequential radiochemistry necessary to measure any environmental sample for 228,230,232Th, 226,228Ra, 234,235,238U and 210Pb. To utilize the radiochemistry and accurately trace and delineate these nuclides in the environment. To obtain historic and present radiochemical data to determine the need for supplemental soil/water etc., measurements.« less